General :: Restart PADS From Java Program

I am facing problems to restart PADS(Passive asset detection system) from java program.I used the root as a user. So from the command prompt I can start PADS with out sudo ,but when I try to start PADS from the my java program i.e.

Process proc=Runtime.getRuntime().exec("pads restart");

It throws the error in log that FATAL error ! you not root and permission denied.

Then I tried the same with sudo

Process proc=Runtime.getRuntime().exec("sudo pads restart";

Here it create another two process extra
1 for stop the pads
2) for start the pads

It does not kill the previous process of PADS .and both the process get hung.